Ksplice is pretty some pretty interesting software for Linux. Its a service that patches the running kernel without any reboot taking place. On a critical server you dont want any downtime on or where you want to choose your own downtime its damn near perfect. Sure you probably have some kind of HA and multiple servers but that doesn't mean its convenient to take the machines down all the time for updates.
To my knowledge there isn't anything even remotely similar for Windows but its not that much of a problem, they have to be rebooted all the time anyway because of locked files, lost system resources and whatnot.
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